Commit | Line | Data |
---|---|---|
ffcdbf5b BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
2 | #include <retrofit.h> | |
3 | #include <stdio.h> | |
4 | /* | |
5 | * fold - fold long lines for finite output devices | |
6 | * | |
7 | * Bill Joy UCB June 28, 1977 | |
8 | */ | |
9 | ||
10 | int fold = 80; | |
11 | ||
12 | main(argc, argv) | |
13 | int argc; | |
14 | char *argv[]; | |
15 | { | |
16 | register c; | |
17 | FILE *f; | |
18 | char obuf[BUFSIZ]; | |
19 | ||
20 | argc--, argv++; | |
21 | setbuf(stdout, obuf); | |
22 | if (argc > 0 && argv[0][0] == '-') { | |
23 | fold = 0; | |
24 | argv[0]++; | |
25 | while (*argv[0] >= '0' && *argv[0] <= '9') | |
26 | fold =* 10, fold =+ *argv[0]++ - '0'; | |
27 | if (*argv[0]) { | |
28 | printf("Bad number for fold\n"); | |
29 | exit(1); | |
30 | } | |
31 | argc--, argv++; | |
32 | } | |
33 | do { | |
34 | if (argc > 0) { | |
35 | if (freopen(argv[0], "r", stdin) == NULL) { | |
36 | perror(argv[0]); | |
37 | exit(1); | |
38 | } | |
39 | argc--, argv++; | |
40 | } | |
41 | for (;;) { | |
42 | c = getc(stdin); | |
43 | if (c == -1) | |
44 | break; | |
45 | putch(c); | |
46 | } | |
47 | } while (argc > 0); | |
48 | exit(0); | |
49 | } | |
50 | ||
51 | int col; | |
52 | ||
53 | putch(c) | |
54 | register c; | |
55 | { | |
56 | register ncol; | |
57 | ||
58 | switch (c) { | |
59 | case '\n': | |
60 | ncol = 0; | |
61 | break; | |
62 | case '\t': | |
63 | ncol = (col + 8) &~ 7; | |
64 | break; | |
65 | case '\b': | |
66 | ncol = col ? col - 1 : 0; | |
67 | break; | |
68 | case '\r': | |
69 | ncol = 0; | |
70 | break; | |
71 | default: | |
72 | ncol = col + 1; | |
73 | } | |
74 | if (ncol > fold) | |
75 | putchar('\n'), col = 0; | |
76 | putchar(c); | |
77 | switch (c) { | |
78 | case '\n': | |
79 | col = 0; | |
80 | break; | |
81 | case '\t': | |
82 | col =+ 8; | |
83 | col =& ~7; | |
84 | break; | |
85 | case '\b': | |
86 | if (col) | |
87 | col--; | |
88 | break; | |
89 | case '\r': | |
90 | col = 0; | |
91 | break; | |
92 | default: | |
93 | col++; | |
94 | break; | |
95 | } | |
96 | } |